Lathe-carriage



( o Model W. LODGE.

LATHE GARRIAGE,

No. 396,700. Patented gain. 22, 1889.

INVENTOR:

WITNESSES: X5 @644,

UNITED STATES PATENT OFFICE,

IVILLIAM LODGE, OF CINCINNATI, OHIO.

, LATHE-CARRIAGE.

SPECIFICATION forming part of Letters Patent No. 396,700, dated January22, 1889. Application filed May 18, 1888. Serial No. 274,340. (Nomodel.)

To aZZ whom it may concern:

Be it known that I, \VILLIAM LODGE, a citizen of the United States,residing at Oineinnati, in the county of Hamilton and State of Ohio,have invented a new and useful Improvement in Lathes, of which thefollowing is a specification.

My invention relates to the screw-eutting mechanism in lathes; and itconsists of a new and useful device for connecting and disconnecting thecarriage or saddle with the leadscrew.

The objects of my invention are, first, to lay the lead-screw in theinside of the lathe-bed close to the center of gravity of the combinedtool carrying and feeding mechanism and as near as possible to theresistance caused by the cutting tool, and thus avoiding excessivestrain on the carriage and lead-screw; second, to journal the lead-screwon both sides of the half-nuts, so as to prevent the same from bendingand sagging; third, to so combine the box holding the half-nuts with thecarriage as to form an almost solid body, and, fourth, to have a deviceboth substantial and operative from the front of the lathe. I attainthese objects by the mechanism illustrated in the accompanying drawings,in. whieh- Figure 1 is a longitudinal section through a well lcnowncarriage and front ways of a lathe on the line 3 i 5 (5, Fig. 2, with myimprovement attached to it. 2 shows a section through a cross-bridge ofa carriage in connection with my improved device on the section-line 12, Fig. 1. Fig. 3 is a top view of my invention detached from thecarriage, and Fig. at shows the half-nuts in a perspective view.

Similar letters refer to similar parts throughout the several views.

In Fig. 1, A represents the carriage, and B the front ways, of a lathe.I) is a rod journaled in the carriage, having on its front end anactuating-crank, a, and on the other end a lever, c, secured to it.Lever c engages with a cam, (Z, sliding on bar 6, fixed on both ends inbox S. BoXS is of a rectangular shape, fits sidewise tightly oversuitable projections east on the lower part of the carriagecross-bridge,

is held in place by four symmetrically-placed screws, of which two, jand It, can be seen in Fig. 1, and so located as to movein the inside ofthe lathe-bed. Its front end extends under the inside of the front ways,B, and forms on both sides tubular extensions m and n, Fig. 3, throughwhich passes the lead-screw O, and journals the same. By thisconstruction said lead-screw is prevented from bending and sagging, andat the same time is shielded from dirt and shavings. The inside of box Sreceives the two half-nuts q and r and guides them on their sides andbottom.

The half-nuts q and r slide with their wings on top of each other, andare so constructed that the upper winforms the outer half and the lowerone the inner half of the nut. The parts forming the nut in front andthe legs 11: and 1*, east on half-nut 1', serve as supports. By means ofsuitable lugs cast on the wings, studs g and 1', mounted with rollers fand h, are secured to them. The lug on the lower wing passes through anopening in the top one to bring both rollers into the same plane andallow the necessary movement.

The rollers f and g engage, respectively, with the grooves 11, and 15 incam (Z, and the latter serves on its bottom as a guide for thehalf-nuts, so as to make thewhole mechanism self-contained.

To open the half-nuts, crank a is given about a quarter of a turn to theleft, which moves cam (Z to the right, and as its grooves 10 andidiverge also studs g and t, with half-nuts q and 1, follow thisdirection, and thus disconnects the carriage from the lead-screw, andvice 'versa.

Having thus described the mode of opera tion, I claim as new, and desireto secure by Letters Patent, the following:

1. The combination, with a lathe-bed having a lead-screw mounted insideof the same un der the front shear, of a carriage having secured tothelower part of its cross-bridge the rectangular box S, provided on eachside with the extension tubular journals for the leadscrew,substantially as set forth.

2. In a lathe, the combination, with the car riage thereof, having thebox S, of the sliding 0am (I and the half-nuts q and 0', having the wingof one superposed upon the other and provided with the roller-cappedstuds engaging the grooves of said cam, substantially as described.

The combination in a lathe, of the earriage and its box S, the rod 1),journaled in the carriage and having atone end an, actuatingerank and atthe other a lever, c, the sliding cam actuated by said lever, and thehalf-nuts 10 with their studsin engagement with said cam,

substantially as described.

XVILLIAM LODGE.

Witnesses:

E. D. GOODWIN, BURT. DOAN.

